Key Technical Parameters General & Protection Product / Model: ABB TA75DU‑42M Thermal Overload Relay Part Number: 1SAZ321201R2003 Device Type: Thermal overload protection relay Application: Protection of three‑phase motors from overload and phase loss Mounting: Mounted directly onto compatible contactors (e.g., AX50, AX65, AX80 series) Trip Class: Class 10A (standard thermal trip characteristic) Reset: Manual or automatic reset configurable Current & Settings Adjustable Current Setting Range: 29 – 42 A Rated Operational Current (Ie): 42 A Temperature Compensation: Yes (helps maintain consistent protection across ambient temps) Phase Protection: Detects phase failure and imbalance Contacts & Signals Auxiliary Contacts: 1 Normally Closed (NC) – trip contact 1 Normally Open (NO) – signal/indication contact Signal/Control Contact Ratings: Suitable for control logic and panel indication circuits Electrical & Connection Rated Insulation Voltage: Up to 690 V AC (main circuit) Rated Operational Voltage (Main Circuit): Up to 690 V AC Auxiliary Contact Ratings: Typical small control loads (e.g., up to a few amps at common control voltages) Terminal Type: Screw terminals for main and auxiliary circuits Suitable Contactor Types: AX50, AX65, AX80 series contactors Physical & Environmental Poles: 3‑pole (for three‑phase circuits) Degree of Protection: IP20 (housing terminals protected) Ambient Operating Temperature Range: ~‑25 °C to +55 °C Storage Temperature Range: ~‑40 °C to +70 °C Product Size (approx): Width ~54 mm × Height ~90 mm × Depth ~111 mm Net Weight: ~0.33 kg Features & Functions Trip‑Free Mechanism: Ensures the relay remains open once tripped until reset Stop and Test Buttons: Allows simulation and stopping for testing and safety verification Reliable Electromechanical Protection: Uses bimetal elements for thermal detection Temperature Compensation: Maintains accurate trip over temperature variations